Structure of Matter

Question 1

What is a compound?

Answer 1

Compounds can be decomposed into simpler substances by ordinary chemical means.

Question 2

What is an element?

Answer 2

Elements cannot be further decomposed by ordinary chemical means.

Question 3

What is an atom?

Answer 3

The smallest quantity of a substance that can exist. All substances are made up of atoms. Single, free atoms are not always stable and combine with other atoms to form molecules.

Question 4

What is a molecule?

Answer 4

The smallest chemical unit of a substance capable of independent existance.

Question 5

What is an isotope?

Answer 5

Atoms whose nuclei have the same Z but different N. Electron structure is the same, and therefore chemical properties are similar.

Question 6

What is an isotone?

Answer 6

Nuclides with the same N but different Z.

Question 7

What is an isobar?

Answer 7

Nuclides with the same mass number A

Question 8

What is the size of a nucleus?

Answer 8

~0.1 nm

Question 9

What is the size of an atom?

Answer 9

~ 0.1 nm